Generated by the worldenergydata field-development playbook (epic #567). Recommendation is heuristic (Concept Select / FEL-1 fidelity), not a sanctioned design.
Coulomb is a two-well (C-2/C-3) deepwater dry-gas accumulation in Mississippi Canyon 657/613 that was too small and too remote to justify a dedicated floating host, so it was developed as an all-subsea wet-tree tieback over a 27-mile (~43 km) flowline to the existing BP/Shell Na Kika semisubmersible FPS rather than the ref's semisub_fps designation. At ~7,565 ft the two wells were the deepest-water subsea completions in the world at startup, demanding long-offset flow assurance (insulation, methanol/MEG and metering of a dry-gas stream) over the extended tieback. Routing the gas to spare capacity on Na Kika's centrally located host avoided new topsides capex for a modest reserve. The concept is the field's tieback, not Na Kika's semi type. Notable: At startup its C-2/C-3 wells were the world's deepest-water subsea completions (~7,565 ft).
| Concept | Score | Trees | Rationale / flags |
|---|---|---|---|
| subsea_tieback ★ | 0.832 | wet | host within 60 km with spare capacity tieback 43.5 km exceeds ~32 km — flow-assurance economics deteriorate (insulation/heating needed) |
| semisub_fps | 0.746 | wet | — |
| subsea_to_shore | 0.734 | wet | — |
| spar | 0.724 | dry | — |
| fpso | 0.688 | wet | — hurricane regime: FPSO needs a disconnectable turret |
★ = the concept actually selected for this field (where known).
Sources: SubseaIQ field catalog (~2014) + BSEE + curated vessel/ subsea catalogs. Schematics are deterministic, generated from the field concept.